Relation of Serum Hepcidin Levels and Restless Legs Syndrome in Patients Undergoing Peritoneal Dialysis

Cerebral blood flow changes in maintenance hemodialysis patients with restless legs syndrome and their clinical significance:a cross-sectional case-control study

OBJECTIVE

Restless legs syndrome (RLS) stands as a prevalent neurological complication within maintenance hemodialysis (MHD) patients. However, the alterations in cerebral blood flow (CBF) among MHD-RLS patients remain uncharted. Through the utilization of the arterial spin labeling (ASL) technique, we evaluated the fluctuations in CBF within distinct brain regions and analyzed the risk factors for the development of RLS in MHD patients in the context of the clinic.

METHODS

Thirty-one MHD patients with concomitant RLS (MHD-RLS group) and thirty-one non-RLS patients matched based on age, gender, as well as cognitive function (MHD-nRLS group) were included. Through image preprocessing and data analysis, the changes in CBF values in distinct brain regions were obtained, and the CBF values of brain regions with substantial differences between the two groups were correlated with the RLS scores. Furthermore, the differences in baseline data were compared, and through the utilization of multifactorial logistic regression, the independent risk factors for the development of RLS were examined.

RESULTS

Compared with the MHD-nRLS group, the MHD-RLS group had increased CBF in the right superior temporal gyrus, reduced CBF in the right hippocampus, left middle frontal gyrus, inferior frontal gyrus of right triangle, middle frontal gyrus of left orbit, left precentral gyrus, and left precuneus. Only left precentral gyrus CBF were negatively correlated with RLS scores after correction for dialysis duration(r = -0.436, P = 0.016). Accordingly, multifactorial regression analysis by stepwise method yielded that the left precentral gyrus CBF values(OR: 0.968, 95%CI: 0.944-0.993, P = 0.012) remained an independent risk factor for RLS in MHD patients. In addition, the results showed that hemodialysis duration (OR: 1.055, 95%CI: 1.014-1.098, P = 0.008) and serum iron levels (OR: 0.685, 95%CI: 0.551-0.852, P = 0.001) were also risk factors for the development of RLS.

CONCLUSION

Patients afflicted with MHD-RLS exhibit alterations in CBF across several brain regions. Notably, the left precentral gyrus might serve as a pivotal region influencing the onset of RLS among MHD patients. Furthermore, extended hemodialysis duration and a relative insufficiency in serum iron levels independently contribute as risk factors for RLS development within the MHD patient population.

Review of the role of the endogenous opioid and melanocortin systems in the restless legs syndrome

Restless legs syndrome (RLS) is responsive to opioid, dopaminergic and iron-based treatments. Receptor blocker studies in RLS patients suggest that the therapeutic efficacy of opioids is specific to the opioid receptor and mediated indirectly through the dopaminergic system. An RLS autopsy study reveals decreases in endogenous opioids, β-endorphin and perhaps Met-enkephalin in the thalamus of RLS patients. A total opioid receptor knock-out (mu, delta and kappa) and a mu-opioid receptor knock-out mouse model of RLS show circadian motor changes akin to RLS and, although both models show sensory changes, the mu-opioid receptor knock mouse shows circadian sensory changes closest to those seen in idiopathic RLS. Both models show changes in striatal dopamine, anaemia and low serum iron. However, only in the total receptor knock-out mouse do we see the decreases in serum ferritin that are normally found in RLS. There are also decreases in serum iron when wild-type mice are administered a mu-opioid receptor blocker. In addition, the mu-opioid receptor knock-out mouse also shows increases in striatal zinc paralleling similar changes in RLS. Adrenocorticotropic hormone and α-melanocyte stimulating hormone are derived from pro-opiomelanocortin as is β-endorphin. However, they cause RLS-like symptoms and periodic limb movements when injected intraventricularly into rats. These results collectively suggest that an endogenous opioid deficiency is pathogenetic to RLS and that an altered melanocortin system may be causal to RLS as well.

Feasibility and effect of emotional freedom therapy on sleep quality in patients with end-stage renal disease receiving maintenance hemodialysis: A pilot study

OBJECTIVE

To explore the feasibility and efficacy of emotional freedom therapy (EFT) in improving sleep quality and managing negative emotions in end-stage renal disease patients on maintenance hemodialysis.

METHODS

Between May 2021 and February 2022, 66 maintenance hemodialysis patients with sleep problems were recruited and randomized into an intervention and control group. The intervention group underwent a 12-week intervention of EFT. Two groups' hospital anxiety depression scale (HADS) scores, Pittsburgh sleep quality index (PSQI), and interdialysis weight gain (IDWG) before and one week after the formal intervention were collected and compared. Feasibility analysis was performed using a feasibility questionnaire and in-depth interviews with patients.

RESULTS

Before the intervention, there was no statistical difference in the anxiety, depression, PSQI scores and IDWG between the two groups. After balancing the effects of gender and pre-intervention scores, two-way ANCOVA results showed that there were statistically significant differences between the two groups after the intervention in terms of anxiety, depression, sleep quality, sleep duration, daytime dysfunction and PSQI total score. However, interactions effect for IDWG was statistically significant. Simple effects analysis revealed a difference in post-intervention IDWG between the intervention and control groups for patients over 65 (p < 0.05). Most patients agreed or strongly agreed that the EFT was easy to schedule and they did not experience difficulties during learning the EFT process (respectively 75% and 71.88%). And 75% of the participants were willing to continue practicing EFT. Qualitative content analysis identified five prominent categories related to feasibility and acceptability: affirmation, benefits, communication, support and trust.

CONCLUSION

EFT can relieve anxiety and depression, enhance sleep quality, and improve the physical condition of patients with end-stage renal disease receiving maintenance hemodialysis. As well, the EFT intervention is practicable, acceptable, and perceived as being beneficial to the patient.